1 //===-- UnwindAssemblyInstEmulation.cpp --------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "UnwindAssemblyInstEmulation.h" 11 12 #include "lldb/Core/Address.h" 13 #include "lldb/Core/ArchSpec.h" 14 #include "lldb/Core/DataBufferHeap.h" 15 #include "lldb/Core/DataExtractor.h" 16 #include "lldb/Core/Disassembler.h" 17 #include "lldb/Core/Error.h" 18 #include "lldb/Core/Log.h" 19 #include "lldb/Core/PluginManager.h" 20 #include "lldb/Core/StreamString.h" 21 #include "lldb/Target/ExecutionContext.h" 22 #include "lldb/Target/Process.h" 23 #include "lldb/Target/Thread.h" 24 #include "lldb/Target/Target.h" 25 26 using namespace lldb; 27 using namespace lldb_private; 28 29 30 31 //----------------------------------------------------------------------------------------------- 32 // UnwindAssemblyInstEmulation method definitions 33 //----------------------------------------------------------------------------------------------- 34 35 bool 36 UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly (AddressRange& range, 37 Thread& thread, 38 UnwindPlan& unwind_plan) 39 { 40 if (range.GetByteSize() > 0 && 41 range.GetBaseAddress().IsValid() && 42 m_inst_emulator_ap.get()) 43 { 44 45 // The instruction emulation subclass setup the unwind plan for the 46 // first instruction. 47 m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan); 48 49 // CreateFunctionEntryUnwind should have created the first row. If it 50 // doesn't, then we are done. 51 if (unwind_plan.GetRowCount() == 0) 52 return false; 53 54 ExecutionContext exe_ctx; 55 thread.CalculateExecutionContext(exe_ctx); 56 const bool prefer_file_cache = true; 57 DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch, 58 NULL, 59 NULL, 60 exe_ctx, 61 range, 62 prefer_file_cache)); 63 64 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 65 66 if (disasm_sp) 67 { 68 69 m_range_ptr = ⦥ 70 m_thread_ptr = &thread; 71 m_unwind_plan_ptr = &unwind_plan; 72 73 const uint32_t addr_byte_size = m_arch.GetAddressByteSize(); 74 const bool show_address = true; 75 const bool show_bytes = true; 76 m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), 77 unwind_plan.GetInitialCFARegister(), 78 m_cfa_reg_info); 79 80 m_fp_is_cfa = false; 81 m_register_values.clear(); 82 m_pushed_regs.clear(); 83 84 // Initialize the CFA with a known value. In the 32 bit case 85 // it will be 0x80000000, and in the 64 bit case 0x8000000000000000. 86 // We use the address byte size to be safe for any future address sizes 87 m_initial_sp = (1ull << ((addr_byte_size * 8) - 1)); 88 RegisterValue cfa_reg_value; 89 cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size); 90 SetRegisterValue (m_cfa_reg_info, cfa_reg_value); 91 92 const InstructionList &inst_list = disasm_sp->GetInstructionList (); 93 const size_t num_instructions = inst_list.GetSize(); 94 95 if (num_instructions > 0) 96 { 97 Instruction *inst = inst_list.GetInstructionAtIndex (0).get(); 98 const addr_t base_addr = inst->GetAddress().GetFileAddress(); 99 100 // Make a copy of the current instruction Row and save it in m_curr_row 101 // so we can add updates as we process the instructions. 102 UnwindPlan::RowSP last_row = unwind_plan.GetLastRow(); 103 UnwindPlan::Row *newrow = new UnwindPlan::Row; 104 if (last_row.get()) 105 *newrow = *last_row.get(); 106 m_curr_row.reset(newrow); 107 108 // Once we've seen the initial prologue instructions complete, save a 109 // copy of the CFI at that point into prologue_completed_row for possible 110 // use later. 111 int instructions_since_last_prologue_insn = 0; // # of insns since last CFI was update 112 113 bool reinstate_prologue_next_instruction = false; // Next iteration, re-install the prologue row of CFI 114 115 bool last_instruction_restored_return_addr_reg = false; // re-install the prologue row of CFI if the next instruction is a branch immediate 116 117 bool return_address_register_has_been_saved = false; // if we've seen the ra register get saved yet 118 119 UnwindPlan::RowSP prologue_completed_row; // copy of prologue row of CFI 120 121 // cache the pc register number (in whatever register numbering this UnwindPlan uses) for 122 // quick reference during instruction parsing. 123 uint32_t pc_reg_num = LLDB_INVALID_REGNUM; 124 RegisterInfo pc_reg_info; 125 if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) 126 pc_reg_num = pc_reg_info.kinds[unwind_plan.GetRegisterKind()]; 127 else 128 pc_reg_num = LLDB_INVALID_REGNUM; 129 130 // cache the return address register number (in whatever register numbering this UnwindPlan uses) for 131 // quick reference during instruction parsing. 132 uint32_t ra_reg_num = LLDB_INVALID_REGNUM; 133 RegisterInfo ra_reg_info; 134 if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info)) 135 ra_reg_num = ra_reg_info.kinds[unwind_plan.GetRegisterKind()]; 136 else 137 ra_reg_num = LLDB_INVALID_REGNUM; 138 139 for (size_t idx=0; idx<num_instructions; ++idx) 140 { 141 m_curr_row_modified = false; 142 m_curr_insn_restored_a_register = false; 143 inst = inst_list.GetInstructionAtIndex (idx).get(); 144 if (inst) 145 { 146 if (log && log->GetVerbose ()) 147 { 148 StreamString strm; 149 inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, NULL); 150 log->PutCString (strm.GetData()); 151 } 152 153 m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), 154 inst->GetAddress(), 155 exe_ctx.GetTargetPtr()); 156 157 m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions); 158 159 // Were there any changes to the CFI while evaluating this instruction? 160 if (m_curr_row_modified) 161 { 162 reinstate_prologue_next_instruction = false; 163 m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); 164 // Append the new row 165 unwind_plan.AppendRow (m_curr_row); 166 167 // Allocate a new Row for m_curr_row, copy the current state into it 168 UnwindPlan::Row *newrow = new UnwindPlan::Row; 169 *newrow = *m_curr_row.get(); 170 m_curr_row.reset(newrow); 171 172 // If m_curr_insn_restored_a_register == true, we're looking at an epilogue instruction. 173 // Set instructions_since_last_prologue_insn to a very high number so we don't append 174 // any of these epilogue instructions to our prologue_complete row. 175 if (m_curr_insn_restored_a_register == false && instructions_since_last_prologue_insn < 8) 176 instructions_since_last_prologue_insn = 0; 177 else 178 instructions_since_last_prologue_insn = 99; 179 180 UnwindPlan::Row::RegisterLocation pc_regloc; 181 UnwindPlan::Row::RegisterLocation ra_regloc; 182 183 // While parsing the instructions of this function, if we've ever 184 // seen the return address register (aka lr on arm) in a non-IsSame() state, 185 // it has been saved on the stack. If it's ever back to IsSame(), we've 186 // executed an epilogue. 187 if (ra_reg_num != LLDB_INVALID_REGNUM 188 && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) 189 && !ra_regloc.IsSame()) 190 { 191 return_address_register_has_been_saved = true; 192 } 193 194 // If the caller's pc is "same", we've just executed an epilogue and we return to the caller 195 // after this instruction completes executing. 196 // If there are any instructions past this, there must have been flow control over this 197 // epilogue so we'll reinstate the original prologue setup instructions. 198 if (prologue_completed_row.get() 199 && pc_reg_num != LLDB_INVALID_REGNUM 200 && m_curr_row->GetRegisterInfo (pc_reg_num, pc_regloc) 201 && pc_regloc.IsSame()) 202 { 203 if (log && log->GetVerbose()) 204 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- pc is <same>, restore prologue instructions."); 205 reinstate_prologue_next_instruction = true; 206 } 207 else if (prologue_completed_row.get() 208 && return_address_register_has_been_saved 209 && ra_reg_num != LLDB_INVALID_REGNUM 210 && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) 211 && ra_regloc.IsSame()) 212 { 213 if (log && log->GetVerbose()) 214 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- lr is <same>, restore prologue instruction if the next instruction is a branch immediate."); 215 last_instruction_restored_return_addr_reg = true; 216 } 217 } 218 else 219 { 220 // If the previous instruction was a return-to-caller (epilogue), and we're still executing 221 // instructions in this function, there must be a code path that jumps over that epilogue. 222 // Also detect the case where we epilogue & branch imm to another function (tail-call opt) 223 // instead of a normal pop lr-into-pc exit. 224 // Reinstate the frame setup from the prologue. 225 if (reinstate_prologue_next_instruction 226 || (m_curr_insn_is_branch_immediate && last_instruction_restored_return_addr_reg)) 227 { 228 if (log && log->GetVerbose()) 229 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- Reinstating prologue instruction set"); 230 UnwindPlan::Row *newrow = new UnwindPlan::Row; 231 *newrow = *prologue_completed_row.get(); 232 m_curr_row.reset(newrow); 233 m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); 234 unwind_plan.AppendRow(m_curr_row); 235 236 newrow = new UnwindPlan::Row; 237 *newrow = *m_curr_row.get(); 238 m_curr_row.reset(newrow); 239 240 reinstate_prologue_next_instruction = false; 241 last_instruction_restored_return_addr_reg = false; 242 m_curr_insn_is_branch_immediate = false; 243 } 244 245 // clear both of these if either one wasn't set 246 if (last_instruction_restored_return_addr_reg) 247 { 248 last_instruction_restored_return_addr_reg = false; 249 } 250 if (m_curr_insn_is_branch_immediate) 251 { 252 m_curr_insn_is_branch_immediate = false; 253 } 254 255 // Stop updating the prologue instructions if we've seen 8 non-prologue instructions 256 // in a row. 257 if (instructions_since_last_prologue_insn++ < 8) 258 { 259 UnwindPlan::Row *newrow = new UnwindPlan::Row; 260 *newrow = *m_curr_row.get(); 261 prologue_completed_row.reset(newrow); 262 if (log && log->GetVerbose()) 263 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- saving a copy of the current row as the prologue row."); 264 } 265 } 266 } 267 } 268 } 269 // FIXME: The DisassemblerLLVMC has a reference cycle and won't go away if it has any active instructions. 270 // I'll fix that but for now, just clear the list and it will go away nicely. 271 disasm_sp->GetInstructionList().Clear(); 272 } 273 274 if (log && log->GetVerbose ()) 275 { 276 StreamString strm; 277 lldb::addr_t base_addr = range.GetBaseAddress().GetLoadAddress(thread.CalculateTarget().get()); 278 strm.Printf ("Resulting unwind rows for [0x%" PRIx64 " - 0x%" PRIx64 "):", base_addr, base_addr + range.GetByteSize()); 279 unwind_plan.Dump(strm, &thread, base_addr); 280 log->PutCString (strm.GetData()); 281 } 282 return unwind_plan.GetRowCount() > 0; 283 } 284 return false; 285 } 286 287 bool 288 UnwindAssemblyInstEmulation::GetFastUnwindPlan (AddressRange& func, 289 Thread& thread, 290 UnwindPlan &unwind_plan) 291 { 292 return false; 293 } 294 295 bool 296 UnwindAssemblyInstEmulation::FirstNonPrologueInsn (AddressRange& func, 297 const ExecutionContext &exe_ctx, 298 Address& first_non_prologue_insn) 299 { 300 return false; 301 } 302 303 UnwindAssembly * 304 UnwindAssemblyInstEmulation::CreateInstance (const ArchSpec &arch) 305 { 306 std::unique_ptr<EmulateInstruction> inst_emulator_ap (EmulateInstruction::FindPlugin (arch, eInstructionTypePrologueEpilogue, NULL)); 307 // Make sure that all prologue instructions are handled 308 if (inst_emulator_ap.get()) 309 return new UnwindAssemblyInstEmulation (arch, inst_emulator_ap.release()); 310 return NULL; 311 } 312 313 314 //------------------------------------------------------------------ 315 // PluginInterface protocol in UnwindAssemblyParser_x86 316 //------------------------------------------------------------------ 317 ConstString 318 UnwindAssemblyInstEmulation::GetPluginName() 319 { 320 return GetPluginNameStatic(); 321 } 322 323 uint32_t 324 UnwindAssemblyInstEmulation::GetPluginVersion() 325 { 326 return 1; 327 } 328 329 void 330 UnwindAssemblyInstEmulation::Initialize() 331 { 332 PluginManager::RegisterPlugin (GetPluginNameStatic(), 333 GetPluginDescriptionStatic(), 334 CreateInstance); 335 } 336 337 void 338 UnwindAssemblyInstEmulation::Terminate() 339 { 340 PluginManager::UnregisterPlugin (CreateInstance); 341 } 342 343 344 ConstString 345 UnwindAssemblyInstEmulation::GetPluginNameStatic() 346 { 347 static ConstString g_name("inst-emulation"); 348 return g_name; 349 } 350 351 const char * 352 UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() 353 { 354 return "Instruction emulation based unwind information."; 355 } 356 357 358 uint64_t 359 UnwindAssemblyInstEmulation::MakeRegisterKindValuePair (const RegisterInfo ®_info) 360 { 361 lldb::RegisterKind reg_kind; 362 uint32_t reg_num; 363 if (EmulateInstruction::GetBestRegisterKindAndNumber (®_info, reg_kind, reg_num)) 364 return (uint64_t)reg_kind << 24 | reg_num; 365 return 0ull; 366 } 367 368 void 369 UnwindAssemblyInstEmulation::SetRegisterValue (const RegisterInfo ®_info, const RegisterValue ®_value) 370 { 371 m_register_values[MakeRegisterKindValuePair (reg_info)] = reg_value; 372 } 373 374 bool 375 UnwindAssemblyInstEmulation::GetRegisterValue (const RegisterInfo ®_info, RegisterValue ®_value) 376 { 377 const uint64_t reg_id = MakeRegisterKindValuePair (reg_info); 378 RegisterValueMap::const_iterator pos = m_register_values.find(reg_id); 379 if (pos != m_register_values.end()) 380 { 381 reg_value = pos->second; 382 return true; // We had a real value that comes from an opcode that wrote 383 // to it... 384 } 385 // We are making up a value that is recognizable... 386 reg_value.SetUInt(reg_id, reg_info.byte_size); 387 return false; 388 } 389 390 391 size_t 392 UnwindAssemblyInstEmulation::ReadMemory (EmulateInstruction *instruction, 393 void *baton, 394 const EmulateInstruction::Context &context, 395 lldb::addr_t addr, 396 void *dst, 397 size_t dst_len) 398 { 399 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 400 401 if (log && log->GetVerbose ()) 402 { 403 StreamString strm; 404 strm.Printf ("UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16" PRIx64 ", dst = %p, dst_len = %" PRIu64 ", context = ", 405 addr, 406 dst, 407 (uint64_t)dst_len); 408 context.Dump(strm, instruction); 409 log->PutCString (strm.GetData ()); 410 } 411 memset (dst, 0, dst_len); 412 return dst_len; 413 } 414 415 size_t 416 UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, 417 void *baton, 418 const EmulateInstruction::Context &context, 419 lldb::addr_t addr, 420 const void *dst, 421 size_t dst_len) 422 { 423 if (baton && dst && dst_len) 424 return ((UnwindAssemblyInstEmulation *)baton)->WriteMemory (instruction, context, addr, dst, dst_len); 425 return 0; 426 } 427 428 size_t 429 UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, 430 const EmulateInstruction::Context &context, 431 lldb::addr_t addr, 432 const void *dst, 433 size_t dst_len) 434 { 435 DataExtractor data (dst, 436 dst_len, 437 instruction->GetArchitecture ().GetByteOrder(), 438 instruction->GetArchitecture ().GetAddressByteSize()); 439 440 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 441 442 if (log && log->GetVerbose ()) 443 { 444 StreamString strm; 445 446 strm.PutCString ("UnwindAssemblyInstEmulation::WriteMemory ("); 447 data.Dump(&strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX, addr, 0, 0); 448 strm.PutCString (", context = "); 449 context.Dump(strm, instruction); 450 log->PutCString (strm.GetData()); 451 } 452 453 const bool can_replace = true; 454 const bool cant_replace = false; 455 456 switch (context.type) 457 { 458 default: 459 case EmulateInstruction::eContextInvalid: 460 case EmulateInstruction::eContextReadOpcode: 461 case EmulateInstruction::eContextImmediate: 462 case EmulateInstruction::eContextAdjustBaseRegister: 463 case EmulateInstruction::eContextRegisterPlusOffset: 464 case EmulateInstruction::eContextAdjustPC: 465 case EmulateInstruction::eContextRegisterStore: 466 case EmulateInstruction::eContextRegisterLoad: 467 case EmulateInstruction::eContextRelativeBranchImmediate: 468 case EmulateInstruction::eContextAbsoluteBranchRegister: 469 case EmulateInstruction::eContextSupervisorCall: 470 case EmulateInstruction::eContextTableBranchReadMemory: 471 case EmulateInstruction::eContextWriteRegisterRandomBits: 472 case EmulateInstruction::eContextWriteMemoryRandomBits: 473 case EmulateInstruction::eContextArithmetic: 474 case EmulateInstruction::eContextAdvancePC: 475 case EmulateInstruction::eContextReturnFromException: 476 case EmulateInstruction::eContextPopRegisterOffStack: 477 case EmulateInstruction::eContextAdjustStackPointer: 478 break; 479 480 case EmulateInstruction::eContextPushRegisterOnStack: 481 { 482 uint32_t reg_num = LLDB_INVALID_REGNUM; 483 bool is_return_address_reg = false; 484 const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind(); 485 if (context.info_type == EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset) 486 { 487 reg_num = context.info.RegisterToRegisterPlusOffset.data_reg.kinds[unwind_reg_kind]; 488 if (context.info.RegisterToRegisterPlusOffset.data_reg.kinds[eRegisterKindGeneric] == LLDB_REGNUM_GENERIC_RA) 489 is_return_address_reg = true; 490 } 491 else 492 { 493 assert (!"unhandled case, add code to handle this!"); 494 } 495 496 if (reg_num != LLDB_INVALID_REGNUM) 497 { 498 if (m_pushed_regs.find (reg_num) == m_pushed_regs.end()) 499 { 500 m_pushed_regs[reg_num] = addr; 501 const int32_t offset = addr - m_initial_sp; 502 m_curr_row->SetRegisterLocationToAtCFAPlusOffset (reg_num, offset, cant_replace); 503 m_curr_row_modified = true; 504 if (is_return_address_reg) 505 { 506 // This push was pushing the return address register, 507 // so this is also how we will unwind the PC... 508 RegisterInfo pc_reg_info; 509 if (instruction->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) 510 { 511 uint32_t pc_reg_num = pc_reg_info.kinds[unwind_reg_kind]; 512 if (pc_reg_num != LLDB_INVALID_REGNUM) 513 { 514 m_curr_row->SetRegisterLocationToAtCFAPlusOffset (pc_reg_num, offset, can_replace); 515 m_curr_row_modified = true; 516 } 517 } 518 } 519 } 520 } 521 } 522 break; 523 524 } 525 526 return dst_len; 527 } 528 529 bool 530 UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, 531 void *baton, 532 const RegisterInfo *reg_info, 533 RegisterValue ®_value) 534 { 535 536 if (baton && reg_info) 537 return ((UnwindAssemblyInstEmulation *)baton)->ReadRegister (instruction, reg_info, reg_value); 538 return false; 539 } 540 bool 541 UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, 542 const RegisterInfo *reg_info, 543 RegisterValue ®_value) 544 { 545 bool synthetic = GetRegisterValue (*reg_info, reg_value); 546 547 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 548 549 if (log && log->GetVerbose ()) 550 { 551 552 StreamString strm; 553 strm.Printf ("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => synthetic_value = %i, value = ", reg_info->name, synthetic); 554 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 555 log->PutCString(strm.GetData()); 556 } 557 return true; 558 } 559 560 bool 561 UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, 562 void *baton, 563 const EmulateInstruction::Context &context, 564 const RegisterInfo *reg_info, 565 const RegisterValue ®_value) 566 { 567 if (baton && reg_info) 568 return ((UnwindAssemblyInstEmulation *)baton)->WriteRegister (instruction, context, reg_info, reg_value); 569 return false; 570 } 571 bool 572 UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, 573 const EmulateInstruction::Context &context, 574 const RegisterInfo *reg_info, 575 const RegisterValue ®_value) 576 { 577 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 578 579 if (log && log->GetVerbose ()) 580 { 581 582 StreamString strm; 583 strm.Printf ("UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ", reg_info->name); 584 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 585 strm.PutCString (", context = "); 586 context.Dump(strm, instruction); 587 log->PutCString(strm.GetData()); 588 } 589 590 const bool must_replace = true; 591 SetRegisterValue (*reg_info, reg_value); 592 593 switch (context.type) 594 { 595 case EmulateInstruction::eContextInvalid: 596 case EmulateInstruction::eContextReadOpcode: 597 case EmulateInstruction::eContextImmediate: 598 case EmulateInstruction::eContextAdjustBaseRegister: 599 case EmulateInstruction::eContextRegisterPlusOffset: 600 case EmulateInstruction::eContextAdjustPC: 601 case EmulateInstruction::eContextRegisterStore: 602 case EmulateInstruction::eContextRegisterLoad: 603 case EmulateInstruction::eContextAbsoluteBranchRegister: 604 case EmulateInstruction::eContextSupervisorCall: 605 case EmulateInstruction::eContextTableBranchReadMemory: 606 case EmulateInstruction::eContextWriteRegisterRandomBits: 607 case EmulateInstruction::eContextWriteMemoryRandomBits: 608 case EmulateInstruction::eContextArithmetic: 609 case EmulateInstruction::eContextAdvancePC: 610 case EmulateInstruction::eContextReturnFromException: 611 case EmulateInstruction::eContextPushRegisterOnStack: 612 // { 613 // const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 614 // if (reg_num != LLDB_INVALID_REGNUM) 615 // { 616 // const bool can_replace_only_if_unspecified = true; 617 // 618 // m_curr_row.SetRegisterLocationToUndefined (reg_num, 619 // can_replace_only_if_unspecified, 620 // can_replace_only_if_unspecified); 621 // m_curr_row_modified = true; 622 // } 623 // } 624 break; 625 626 case EmulateInstruction::eContextRelativeBranchImmediate: 627 { 628 629 { 630 m_curr_insn_is_branch_immediate = true; 631 } 632 } 633 break; 634 635 case EmulateInstruction::eContextPopRegisterOffStack: 636 { 637 const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 638 if (reg_num != LLDB_INVALID_REGNUM) 639 { 640 m_curr_row->SetRegisterLocationToSame (reg_num, must_replace); 641 m_curr_row_modified = true; 642 m_curr_insn_restored_a_register = true; 643 } 644 } 645 break; 646 647 case EmulateInstruction::eContextSetFramePointer: 648 if (!m_fp_is_cfa) 649 { 650 m_fp_is_cfa = true; 651 m_cfa_reg_info = *reg_info; 652 const uint32_t cfa_reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 653 assert (cfa_reg_num != LLDB_INVALID_REGNUM); 654 m_curr_row->SetCFARegister(cfa_reg_num); 655 m_curr_row->SetCFAOffset(m_initial_sp - reg_value.GetAsUInt64()); 656 m_curr_row_modified = true; 657 } 658 break; 659 660 case EmulateInstruction::eContextAdjustStackPointer: 661 // If we have created a frame using the frame pointer, don't follow 662 // subsequent adjustments to the stack pointer. 663 if (!m_fp_is_cfa) 664 { 665 m_curr_row->SetCFAOffset (m_initial_sp - reg_value.GetAsUInt64()); 666 m_curr_row_modified = true; 667 } 668 break; 669 } 670 return true; 671 } 672 673 674